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E.g. If you have an input signal of -133dBm. This means the input power is 133dB below 1mW level. Therefore in Watts, you have 5.02e-17watts according to flatulent formula. +ve dBm means you have a power level that is above 1mW.
My explanation to sensitivity similar to flatulent:
Sensitivity is the available input signal level for a given output signal to noise ratio. Sometimes also called the noise floor.
Hi Guys
I had some of these same questions. So here's my additions.
X dBm = 10*log(Y Watts/.001Watts) and the reverse is
Y Watts = 10^{(XdBm-30dBm)/10}
don't get confused with dB.
30dBm = 1Watt
40dBm =10Watts
if you put 30dBm (Pin) in to a 3dB (Gain) Amp, you will get
(Pout)= 33dBm out
33dBm=2Watts
if you put 40dBm (Pin) in to a 3dB (Gain) Amp, you will get
(Pout)= 43dBm out
43dBm=20Watts
I also have not seen the +ve or -ve before.
Sensitivity can also thought of in a practical way as...
If you want a receiver to correctly receive %99 of the data you
send to it you must transmit the data a minimum (sensitivity) level
of X dBm. This is mostly done by using a Bit Error Rate Test (BER)
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